Parse http parameters from a query string. This includes unescaping
of url-encoded values.
Usage
parse_query(query)
Arguments
query
a url-encoded query string
Details
For http GET requests, the query string is specified
in the URL after the question mark. For http POST or PUT requests, the query
string can be used in the request body when the Content-Type header
is set to application/x-www-form-urlencoded.